Invasion generally indicates metastasis; however, depending on your processes, you should query the provider and review the pathology to determine if there are 2 primary sites, or if the pericardium is the acutal mets. This generally works for the inpatient setting rather well, where as in the outpatient setting you may be limited.
If documentation is not clear, or you are not able to query the provider, I would venture to say that lung primary and pericardium mets would be a safe bet.
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